| 摘要 |
The invention provides a noise-maker having an injection molded single piece body, a membrane and a retaining ring. The injection molded single piece body includes a generally cylindrical central tube and a generally cylindrical pressure tube which defines a pressure chamber. The retaining ring has an inner diameter adapted to fit over the outer surface of said pressure tube such that the membrane is secured to and stretched across the central tube first end and the pressure tube first end. Sound is created when air or other gas is forced into pressure chamber. The air must pass through the pressure chamber around a central tube first end and out the discharge end of a sound extension end. By forcing air into the pressure chamber, membrane vibrates producing a loud sound.
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